I have this long formula, that calculates an amount for each month. If u even understand the formula, then u are a pro but ok. I dont want a column for each month, as I have like 3000 rows. I want it to calculate just the month that I choose from this dropdown list, how?
I highlighted the formula in red.
(My next step is also to calculate it per month, now it calculates just the latest mutation, but thats way more complicated as it calculates with only one IN and OUT date per unit. (column AG, AL), but thats for the pro's among us )
Ps. Please dont tell me to use Vlookup, I want to get rid of those 12 columns (months). I just want one.

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